Y:SY
Acting
Born: 2000-01-22 in Seoul, South Korea
Biography
Lee Seo-yeon, known professionally as Y:SY, is a South Korean singer-songwriter and rapper under H1GHR Music. She is a former member of the girl group fromis_9, formed through the reality survival show Idol School (2017). She left the group in 2024. She made her solo debut on November 17, 2025, with the digital single Naked.
Known For
Lee Mujin Service
Guest
The Game Caterers
Self
The Silence Of IDOL
Seoyeon
Jae Joong and Friends
Idol School
Self - Contestant
Duckbap House
Self
Welcome to Heal Inn
fromis_9's Summer Night
Self
Fromis's Room
fromis_9 concert ＜LOVE FROM.＞ IN JAPAN
We See Winter
fromis_9's Autumn Night
Self
